Sorry, but you're an idiot.
The police give a lot of a fuck, that's their job. Photos of you with you're face next to some graffiti is strong evidence that they can rape you in the asshole with. Members of the public that are at all aware of graffiti(and don't like it) will swiftly deliver those photos to the police should they find them.
Plus other writers are generally assholes and if all writers know who you are you will have to spend hours talking about graffiti with every dick who recognises you when really you just want to chill in this party, drink a few beers and concentrate on smashing that bad bitch whos eyeing you.. Either that or you'll have to fight them.
You sound like you don't write graffiti.